/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.zookeeper;

import org.apache.zookeeper.proto.WatcherEvent;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;

/**
 * A WatchedEvent represents a change on the ZooKeeper that a Watcher is able to
 * respond to. The WatchedEvent includes exactly what happened, the current
 * state of the ZooKeeper, and the path of the znode that was involved in the
 * event.
 */
public class WatchedEvent {
	final private EventType eventType;
	final private KeeperState keeperState;
	private String path;

	/**
	 * Create a WatchedEvent with specified type, state and path
	 */
	public WatchedEvent(EventType eventType, KeeperState keeperState, String path) {
		this.keeperState = keeperState;
		this.eventType = eventType;
		this.path = path;
	}

	/**
	 * Convert a WatcherEvent sent over the wire into a full-fledged WatcherEvent
	 */
	public WatchedEvent(WatcherEvent eventMessage) {
		keeperState = KeeperState.fromInt(eventMessage.getState());
		eventType = EventType.fromInt(eventMessage.getType());
		path = eventMessage.getPath();
	}

	public String getPath() {
		return path;
	}

	public KeeperState getState() {
		return keeperState;
	}

	public EventType getType() {
		return eventType;
	}

	/**
	 * Convert WatchedEvent to type that can be sent over network
	 */
	public WatcherEvent getWrapper() {
		return new WatcherEvent(eventType.getIntValue(), keeperState.getIntValue(), path);
	}

	@Override
	public String toString() {
		return "WatchedEvent state:" + keeperState + " type:" + eventType + " path:" + path;
	}
}
